Method for the manufacture of plastic compounds



Patented Sept. 25, 1928.

UNITED STATES PATENT OFFICE.

enonons EMMANUEL ZELGER, or MONTBEUIL, FRANCE, assmnoa, :ar lmsnnassmnnmrrsro nu PONT-PATHE nu: morao'ruame CORPORATION, or winmemoir,DELAWARE, a CORPORATION or DELAWARE. 1

METHOD FOB'THE MANUFACTURE OF PLASTIC COMIOUNDS.

I No Drawing. Original application filed April 6, 1925, Seria1 No.21,187, and in France March 10, 1825. i

' Divided and this application filed my 80, 1926. Serial No. 128,102.

It has been proposed to employ for the manufacture of plastic compounds,and chiefly acetyhcellulose compounds, certain substances which, whenadded to the said compounds render the latter 'uninflammable.

l0 advantageous from the fact that they will not Among the saidsubstances are comprised the phosp I as tri ihenylphosphate andtricresylphosphate, ut these substances are chiefly disdissolveacetylcellulose in the cold state, thus causing a diminution in themechanical properties of the resulting plastic compound.

The present invention which'is a division I .Monomethyl,

ates of the purely aromatic series, such ofmy pending application No. 2l,197, .filed April 6th, 1925, has for its object the use for themanufactureof plastic compounds having cellulose derivatives as a base,of mixed hosphoric esters containing one or more alip atic radicals aswell as one or more aromatic radicals, the nucleus of these latterradicals contaming other elements, such as chlorine, bromine and thelike.

Among the said compounds which can only bevolatilized at hightemperatures are com-- prised the esters having one or more aliphaticgroups and one or more halogen substituted aromatic groups such as:

di (monochlorophenyl) phosphate (C 3) 2P0. 1 I

Monomethyl,

monophenyl, monochlorophenyl phosphate (CH3) (06H!) P04 7 'j Dimethyl,monochlorophenyl phosphate Dimethyl,mono (dichlorophenyl) phosphate H3)2 JL L) Diethyl,

monochlorophenyl phosphate 2 5) A JL i The following example of the saidprocess may be given:

100 parts acetylcellulose a 20. parts monoethyl di (monochlorophenyl)phosphate'these being mixed and stirred in the known manner forobtaining the requisite plastic compound.

v The invention is not limited to the above it mentioned proportions forthese may varied according to the'qualities .which the finished productis to have.

The use of the substances above indicated is not limited to theprepgaration'of acetyi cellulose plastic compoun but they may employedwith other cellulose derivatives; namely, nitroac'etate of cellulose, orwith cellulose others such as ethyl cellulose, benzyl cellulose and thelike, for which the said substances act either as fireproof substances,or as substances which are at the same time fireproof, plastic andsolvent.

I Having now I claim as new and desire tosecure byLetr ters Patent is:

described my invention, what 1. A plastic compound comprising a mix- Iture'of a cellulose derivative with phosphoric esters containing .bothali hatic radicals and halogenated aromatic ra 'cals." j

. 2. A plastic compound comprising a mixture of acet lcellulose withphosphoric esters containing 0th aliphatic radicals and halogenatedaromatic radicals.

In testimony whereofl have signed my v.name this specification.

GEORGES EMMANUEL ZELGER. 1 I

